SIFIVE_SERIAL_TXCTRL_NSTOP_SHIFT 80 drivers/tty/serial/sifive.c #define SIFIVE_SERIAL_TXCTRL_NSTOP_MASK (1 << SIFIVE_SERIAL_TXCTRL_NSTOP_SHIFT) SIFIVE_SERIAL_TXCTRL_NSTOP_SHIFT 510 drivers/tty/serial/sifive.c v |= (nstop - 1) << SIFIVE_SERIAL_TXCTRL_NSTOP_SHIFT;